Clip view before shelf and leave the rest unclipped

Bug: 172289889
Test: visual
Change-Id: Ic49edf84ba246be9bfff7d39d822ced1d7a23e46

packages/SystemUI/src/com/android/systemui/statusbar/NotificationShelf.java

@@ -204,6 +204,30 @@ public class NotificationShelf extends ActivatableNotificationView implements
         }
     }
 
+    /**
+     * @return whether to clip bottom of given view
+     */
+    private boolean shouldClipBottom(ExpandableView view) {
+        final boolean showShelf = ((ShelfState) getViewState()).hasItemsInStableShelf;
+        if (showShelf) {
+            if (mAmbientState.isShadeOpening()) {
+                final float viewEnd = view.getTranslationY()
+                        + view.getActualHeight()
+                        + mPaddingBetweenElements;
+                final float finalShelfStart = mMaxLayoutHeight - getIntrinsicHeight();
+                // While the shade is opening, only clip view if it overlaps with shelf;
+                // otherwise leave view unclipped.
+                if (viewEnd < finalShelfStart) {
+                    return false;
+                }
+            }
+            // Clip for scrolling.
+            return true;
+        }
+        // Don't clip since we have enough space to show all views.
+        return false;
+    }
+
     /**
      * Update the shelf appearance based on the other notifications around it. This transforms
      * the icons from the notification area into the shelf.
@@ -345,7 +369,9 @@ public class NotificationShelf extends ActivatableNotificationView implements
         clipTransientViews();
 
         setClipTopAmount(clipTopAmount);
-        boolean isHidden = getViewState().hidden || clipTopAmount >= getIntrinsicHeight();
+        boolean isHidden = getViewState().hidden
+                || clipTopAmount >= getIntrinsicHeight()
+                || mAmbientState.isShadeOpening();
         if (mShowNotificationShelf) {
             setVisibility(isHidden ? View.INVISIBLE : View.VISIBLE);
         }
@@ -468,7 +494,8 @@ public class NotificationShelf extends ActivatableNotificationView implements
         } else {
             shouldClipOwnTop = view.showingPulsing();
         }
-        if (viewEnd > notificationClipEnd && !shouldClipOwnTop
+        if (shouldClipBottom(view)
+                && viewEnd > notificationClipEnd && !shouldClipOwnTop
                 && (mAmbientState.isShadeExpanded() || !isPinned)) {
             int clipBottomAmount = (int) (viewEnd - notificationClipEnd);
             if (isPinned) {